Water circulator or booster pump



March 30, 1954 LARSON 2,673,523

WATER CIRCULATOR OR BOOSTER PUMP Filed Nov. 10, 1952 HarryL GIS 0 I:

IN VENT OR 1 I BY /1 ATTORNEYS Patented Mar. 30, 1954 v ,UNITED STATES PATENT OFFICE 2,673,523 WATER CIRCULATOR R BOOSTER PUMP Harry Larson, Duquesne, Pa. Application November 10, 1952, Serial No. 319,720

1 Claim.

nected at one end to the inlet port of the water heating unit, said casing havin a water outlet opening extending through the side thereof adja cent the end thereof remote from the heating unit, a shaft extending axially through the end of the casing adjacent the water outlet opening,

a helical vane carried by the shaft for rotation therewith Within the casing, said vane lying between the water inlet opening and the heating unit, and means carried by the shaft on the exterior or the casing for rotating said shaft and causing the vane to advance water into the heating unit through the casing from the system.

Other features include a drive pulley carried by the shaft on the exterior of the casing, a stop carried by the shaft on the interior of the casing, and yielding means extending between the casing and the pulley for exerting pressure on the shaft and holding the stop in contact with the casing.

In the drawing,

Figure 1 is a longitudinal sectional view through the unit showing it connected in the water circulating system of a hot water heating unit, and

Figure 2 is a View similar to Figure 1 showing the mounting of the water circulating element in section.

Referring to the drawings in detail a water heating unit designated generally I0 is provided with a conventional inlet socket l2 into which is threaded a conventional nipple I 4 carrying at its end remote from the socket [2 a conventional T 6. The lateral leg of the T [6 has connected thereto a conventional pipe I8 through which My improved circulatin unit designated generally comprises a conventional plug 22 which is threadedly engaged in the leg of the T l6 remote from the nipple I4, and extending through said plug is an axial bore 24 which aligns axially with the nipple l4.

Extending through the bore 24 is an elongated bushng 25 carrying adjacent one end an outwardly extending flange 28 and adjacent its opposite end external screw threads 30, the purpose of which will hereafter appear. Mounted in surrounding relation with the bushing 26 between the flange 28 and the end Wall of the plug 22 is sealing gasket 32 and threadedly engaged with the threads 30 of the bushing 26 is a nut 34 which when tightened draws the flange 28 into the sealing bushing 32 to effect a water tight seal between the bushing and the plug.

The end of the bushing remote from the flange 28 is provided with a conventional packing gland 36 and mounted in the bushing for rotation is an elongated shaft 38 which as illustrated projects beyond opposite ends of the plug 22 and is provided intermediate its ends with an outstanding annular collar 40 which is adapted to engage a bearing plate 42 disposed adjacent the end of the bushing 26 carrying the flange 28.

A suitable drive pulley 44 is mounted on the shaft 38 and held in a fixed position thereon by a conventional set screw 46, and surrounding the shaft adjacent the pulley 44 is an anti-friction thrust bearing 43 against which bears a compression coil spring. A cap 52 is threadedly engaged with the threads 30 of the bushing 26 and forms a bearing surface for the end of the spring 53 remote from the anti-friction bearing 48 so as to yieldingly hold the collar 40 against the bearing plate 42. A suitable helical vane 54 is carried by the shaft adjacent the end thereof remote from the pulley 44 as will be readily understood upon reference to the drawings.

In use the plug 22 is threadedly engaged with the T I 6 in axial aligmnent with the nipple [4 so that the spiral vane 54 will be disposed wholly within the nipple I 4. With the parts thus assembled it will be obvious that as the pulley 44 is gitudinally thereof and upon rotating the pulley in a clock-wise direction, the water entering the nipple M from the pipe I 8, l0 will be propelled longitudinally through the nipple and into the heating unit ID.

Whle in the foregoing there has been shown and described the preferred embodiment of this invention it is to be understood that minor to without departing from the spirit and scope of the invention as claimed.

What is claimed is:

In a pump assembly adapted to be entered into an elongated pipe nipple onto which is threaded a T, an externally screw threaded plug adapted to be threaded into an end of the T opposite the 'pipe nipple, said plug having an opening extending axially therethrough, an elongated bushing extending through said bore and having an outwardly extending annular flange adjacent one end thereof for engaging said plug, a clamp nut threadedly engaging the bushing for clamping it in the plug, a shaft extending through the bushing and mounted for rotation therein about its longitudinal axis, a pump vane carried by the shaft for rotation therewith, a drive pulley carried by the shaft for rotation therewith on the side of the plug remote from the vane, the shaft having an annular outwardly extending collar for limiting its movement longitudinally in one direction relative to the bushing, yielding thrust means between the bushing and the drive pulley for yieldingly urging the collar toward the bushing, a sealing gasket about said shaft between said collar and one end of said plug and a packing gland between the other end of said plug and said yielding means.

HARRY LARSON.

References Cited in the file of this patent UNITED STATES PATENTS Number 

